Wow, that's quite a roasting.
Oddly enough, there's not a lot in those previous postings I'd vehemently disagree with. But let me have a crack at fighting back.
Haku underlines the huge value of all those filters Avisynth offers, and of course that's a key feature. Obviously I didn't want to get into 3:2 pulldown and colourspace conversion on a first date; what I did want to do was give beginners a taste for Avisynth while offering them something simple and practical to do with it. And yes, of course, the more processing you demand of Avisynth, the more processing power (or patience) you'll need. But you can certainly get started with Avisynth on very entry-level kit.
"LIfe's too short", and "please shoot me" certainly chime with me. If you like watching TV adverts, or you don't mind interrupting the movie to fast wind through them, then that's the way to go. Likewise if you're happy with the selection of DVDs at your local Blockbusters, knock yourself out. But TV does have a way of digging up old film noir and foreign movies to provide a selection that certainly outshines what's available on my High Street.
Similarly, if you already have the compute power and experience to work with FCP, then this approach to Avisynth won't hold a lot of interest for you. Or perhaps it might. Avisynth and AvsP does simple stuff extraordinarily well and efficiently, once you get the feel of it, and after several years of working with software like Pinnacle Studio and FCP I just find I keep coming back to Avisynth.
"Modern NLEs require quad-core machines with GBs of RAM to do massively complex real-time colour correction, compositing, key-framed effects and multi-track audio mixing, not simply to display an NLE interface." Hello, Daniel. You're right, I was simplifying the Avisynth proposition. And foxyshadis reminds me that with help Avisynth works with Mac OSX. Yes, I did know that -- in fact I do all my Avisynth stuff these days inside a VMWare virtual machine under Leopard running, as it happens, on a quad-core processor with 8 GB of RAM. I sort of count that as "Windows", but foxyshadis' point is worth making and well taken.
Keep the comments coming, please. I'm only too conscious that in tone and content stuff like this Avisynth piece can't please everybody, and can always be better written. I probably respond best to courteous comments, but if that's too much of a stretch for you, hey, I wrote the UNIX column for dear departed PCW for almost a decade. I have a special umbrella for geek spit.